You can purchase MREs and dehydrated foods for your survival pantry as well, however, these foods will work just as well and have the added bonus of being able to be rotated among the food that you use every day, being used in the event that you have a large group to suddenly cook for, being used by the family in the event that you can't afford to go shopping for an extended period of time, and can be donated to the local food bank when it is time to resupply your pantry.

I am guessing that tahini does not have a shelf life once open as long as say, peanut butter. Smaller containers may be a better idea so that it can be used before it goes bad. We tend to make quite a bit of hummus which uses up the tahini pretty quickly.